Compton laser realignment

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User name dalton

Log entry time 11:33:58 on October 01, 2009

Entry number 292561

keyword=Compton laser realignment

It appears that during the down things on the laser table shifted
somewhat. We tried to lock the cavity as usual this morning and it
didn't work. There was an epics event at about 19:30 last night so
initially we thought it was related to this. After investigating this
for a while the laser was aligned in its unlocked state (a tricky job
indeed.) A crude lock was found and the position optimised in the locked
state (much easier.)

Megan tells me that the photon detector table appeard to have been
shifted too. This may all be related to some ion chamber work in the hall.

Two epics ioc reboots and a compton computer reboot were required in
diagnosing the problem. :-)

We achieved 1015 kW in the cavity with the following mirror positions:
1V: 125
1H: -70
2V: 2220
2H: -1480

A copy of this log entry has been emailed to: paschke@jlab.org, camsonne@jlab.org